JP2007278428A - Bearing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bearing device capable of eliminating the work of fastening a thrust plate to a bearing and surely preventing rotation of the bearing. <P>SOLUTION: The bearing device 15 includes four rectangular standing pieces B<SB>1</SB>to B<SB>4</SB>as a bearing holder section. The four rectangular standing pieces are formed by separately rising rectangular peripheral areas respectively extending outwardly from four sides of a square backing plate area S of a plate member 11 at slightly blunt angles with respect to the backing plate area S. The special shape bearing 40 in a square form is press-fitted and secured in a reception hole H defined inside the rectangular standing pieces B<SB>1</SB>to B<SB>4</SB>. The special shape bearing 40 includes a shaft penetrating hole 40a and the thrust plate 30 is interposed between the backing plate area S and an end face of the special shape bearing 40. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a bearing device used for a motor or the like.

In the spindle motor disclosed in JP-A-11-250562, a housing having a cylindrical burring portion as a bearing holder portion, a metal bearing press-fitted into a hole in the burring portion, and caulking and fixing to a lower end side step of the metal bearing A thrust bearing device having a thrust plate is disclosed.
JP-A-11-250562 (FIG. 1)

  In the above thrust bearing, since the burring portion formed on the plate material is bottomless, a process of caulking and fixing the thrust plate to the step on the lower end side of the metal bearing having the through-shaft hole is required for the thrust bearing device. is doing. In addition, although the tolerance of the interference fit between the inner diameter of the burring part and the outer diameter of the metal bearing is important for the metal bearing removal resistance, the thrust plate is caulked and fixed to the step on the bottom side of the metal bearing. Since distortion at the time of caulking causes a deviation in the outer diameter of the end of the metal bearing, it is necessary to loosen the above-mentioned interference fit, and the detent force of the metal bearing deteriorates, resulting in a decrease in yield.

  Therefore, in view of the above problems, an object of the present invention is to provide a bearing device that can eliminate the work of caulking and fixing a thrust plate to the bearing and can realize reliable rotation prevention of the bearing.

  The bearing device according to the present invention includes a plate member including three or more upright pieces that are cut and raised toward the receiving plate area while leaving the surrounding area apart from the receiving plate area, and defined inside the rising pieces. And a deformed bearing press-fitted into the receiving hole.

  By cutting and raising the plate material, three or more upright pieces that serve as bearing holders and a receiving plate area that also functions as a thrust plate remain, so the number of parts of the thrust plate can be reduced, and the thrust plate is crimped to the bearing Fixing work is not required and the manufacturing cost is reduced. Further, since the deformed bearing is press-fitted and fixed in a receiving hole defined inside three or more upright pieces, the anti-rotation effect of the deformed bearing is ensured, and the yield is improved. There is also an advantage that the back surface of the plate material and the back surface of the receiving plate area are naturally flat surfaces. In addition, if the cut-and-raised angle is set to be a little obtuse, the removal strength of the irregular shaped bearing is enhanced.

  Since the odd-shaped bearing is an integrally molded body such as a sintered body, it is preferable to provide an engagement portion that engages with a part or all of the standing pieces.

  Here, when N is a natural number of 3 or more, the outer shape of the receiving plate area and the odd-shaped bearing is both a regular N-square shape, the number of standing pieces is N, and the corners of the irregular-shaped bearing are adjacent to each other. It is desirable to be positioned between the pieces. When N is a regular triangle of 3, a dead space is easily formed, and when the width of the standing piece is narrow, the strength of the standing piece is lowered.

  The above bearing device can be used as a thrust bearing device, and if necessary, as a radial bearing device. However, the irregular shape bearing has a shaft through hole, and a thrust plate is provided between the receiving plate region and the end surface of the irregular shape bearing. In the configuration consisting of, the receiving plate area does not receive the shaft end, but a dedicated thrust plate placed on the receiving plate region receives the shaft end, so it has excellent lubricity and wear resistance A thrust bearing device inferior to the thrust plate can be obtained.

  Here, since the narrow area between the trace holes of the upright piece is connected in a bridging manner at the narrowed portion corresponding to the corner of the backing plate area, when receiving the shaft end directly at the center point of the backing plate area, The bending load on the constricted portion is large due to the concentrated load applied to the center point, and when the plate material is thin, the constricted portion is likely to bend and the shaft end level is likely to be distorted. However, when the thrust plate is interposed, the receiving plate region receives a distributed load, so the bending moment with respect to the constricted portion is small and the constricted portion is not easily bent. Therefore, the width of the standing piece can be widened to increase the strength. it can. In such a case, the workability is improved by pushing the thrust plate into the plurality of upright pieces together with the deformed bearing, compared to the conventional work of crimping and fixing the thrust plate to the bearing.

  In addition, it is suitable to use said bearing apparatus for motor stators, such as a brushless motor.

  According to the present invention, the number of parts of the thrust plate can be reduced, and further, the work of crimping and fixing the thrust plate to the bearing is unnecessary, and the manufacturing cost is reduced. Further, since the deformed bearing is press-fitted and fixed in a receiving hole surrounded by three or more upright pieces, the effect of preventing rotation of the bearing is ensured and the yield is improved.

  Next, embodiments of the present invention will be described with reference to the accompanying drawings. 1A is an external perspective view showing a flat brushless motor according to an embodiment of the present invention, FIG. 1B is a perspective view showing a state in which the rotor of the flat brushless motor is removed, and FIG. 2A. Is a plan view showing the stator side from which the rotor of the flat brushless motor is removed, FIG. 2B is a cross-sectional view showing a state cut along line bb in FIG. 2A, and FIG. 3 is a rear view showing the stator side, FIG. 3 is an assembled perspective view showing the thrust bearing device on the stator side, FIG. 4A is a plan view showing a plate material of the thrust bearing device, and FIG. 4B is the thrust bearing. It is a front view which shows the board | plate material of an apparatus.

  The flat brushless motor of this example includes a stator 10 and a rotor 20 to which a motor rotating shaft 21 is fixed. The stator 10 includes a flat plate material 11 as a housing or a chassis, a flexible printed wiring board 12 mounted thereon and having a round hole 12a, a control circuit integrated circuit I3 mounted on the board 12, and a round circuit. And a plurality of coil windings 14 arranged around the hole 12a. In addition, 12b is an external connection terminal pattern formed on the protruding piece 11a of the plate member 11, and 12c is a wiring pattern.

A central portion of the plate material 11 that fits into the round hole 12 a of the substrate 12 is configured as a thrust bearing device 15. The thrust bearing device 15 of the present example is formed by cutting and raising a little obtuse angle to the receiving plate area S by separating the rectangular peripheral areas of the four sides while leaving the square receiving plate area S of the plate material 11. Rectangular upright pieces B _{1 to} B ₄ and their trace holes h _{1 to} h ₄ . Between the adjacent trace holes among the trace holes h _{1 to} h ₄ , fan-shaped narrow areas E _{1 to} E ₄ are formed, and the narrow areas E _{1 to} E ₄ are formed at the corners of the receiving plate area S. The corresponding narrowed portions Q _{1 to} Q ₄ are connected in a cross-linking manner. The rectangular upright pieces B _{1 to} B ₄ function as bearing holder portions, are flat plates having the same shape, and have the same standing height.

A square thrust plate 30 is dropped into the receiving hole H formed inside the rectangular upright pieces B _{1 to} B ₄ and overlaps the receiving plate area S. The receiving hole H has a through shaft. A square deformed bearing 40 having a hole 40a is press-fitted and fixed. The corner portion of the odd-shaped bearing 40 is located in a gap between adjacent standing pieces among the rectangular standing pieces B _{1 to} B ₄ .

In this way, four rectangular upright pieces B _{1 to} B ₄ that serve as bearing holder portions are formed by cutting and raising the plate material 11, and the receiving plate area S is left, so that the thrust plate is caulked and fixed to the bearing. Can be eliminated. Further, since the deformed bearing 40 is press-fitted and fixed in the receiving hole H defined inside the standing pieces B _{1 to} B ₄ , the anti-rotation effect of the deformed bearing 40 is ensured, and the yield is improved. Moreover, there is an advantage that the back surface of the plate material 11 and the back surface of the receiving plate area S are naturally flat surfaces. Moreover, since the cut-and-raised angle of the upright pieces B _{1 to} B ₄ is set to be a little obtuse, the pulling strength of the deformed bearing 40 is enhanced.

In particular, the profiled bearing 40 since the positive square shape, it is possible to reduce the dead space of the plate material 11, and because the width of the standing piece _B 1 .about.B ₄ can be widened, the intensity of the standing piece _B 1 .about.B ₄ As a result, the holding force of the deformed bearing 40 can be increased.

In this example, even when only the odd-shaped bearing 40 is press-fitted and fixed in the receiving hole H except for the thrust plate 30, the receiving plate region S functions as a thrust plate, and therefore can be used as a thrust bearing device. When a thrust plate 30 having excellent lubricity and wear resistance is used, an inferior thrust bearing device can be obtained. In addition, when the thrust plate 30 is used, the load applied to the receiving plate region S can be dispersed, so that the constriction portions Q _{1 to} Q ₄ are not easily bent. Therefore, the width of the standing pieces B _{1 to} B ₄ is increased. Strength can be increased.

The thrust plate 30 is not limited to a square shape, and may have a projecting piece that overlaps the narrow areas E _{1 to} E ₄ from the corners via the narrowed areas Q _{1 to} Q ₄ . Similarly, the odd-shaped bearing 40 may have a radiating portion that overlaps the protruding piece. This is because the bending moment applied to the constriction portions Q _{1 to} Q ₄ can be further reduced.

In this example, the trace holes h _{1 to} h ₄ are partially closed by the hole edges of the round holes 12 a of the flexible printed wiring board 12 mounted on the plate material 11, but the round holes 12 a are erected pieces B ₁ to B ₁ . if square hole contour prism formed by the B ₄ is fitted, it is possible to block the vent Atoana h ₁ to h ₄ plate completely. Although the number of parts is increased, after the press-fitted profiled bearing 40 into the receiving hole H, the use of the clamping ring to fit vent Atoana h ₁ to h ₄ with tightening the standing piece B ₁ .about.B _4, irregular bearing The force holding 40 is enhanced, and the trace holes h _{1 to} h ₄ can be closed.

(A) is an external appearance perspective view which shows the flat brushless motor which concerns on the Example of this invention, (B) is a perspective view which shows the state which removed the rotor of the flat brushless motor. (A) is a top view which shows the state which removed the rotor of the flat brushless motor, (B) is sectional drawing which shows the state cut | disconnected by the bb line in FIG. 2 (A), (C) is the flat It is a rear view which shows the state which removed the rotor of the shape brushless motor. It is an assembly perspective view showing the thrust bearing device on the same side. (A) is a top view which shows the board | plate material of the thrust bearing apparatus, (B) is a front view which shows the board | plate material of the thrust bearing apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Stator 11 ... Plate material 11a ... Projection piece part 12 ... Flexible printed wiring board 12a ... Round hole 12b ... External connection terminal pattern 12c ... Wiring pattern 13 ... Control integrated circuit 14 ... Coil winding 15 ... Thrust bearing device 20 ... The rotor 21 ... motor rotary shaft 30 ... thrust plate 40 ... profiled bearing 40a ... through axial bore _B 1 .about.B 4 _... rectangular standing piece _E 1 to E 4 _... narrow range H ... receiving holes _h 1 to h 4 _... vent Atoana Q _{1 to} Q ₄ ... Stenosis S ... Receiving plate area

Claims (5)

A plate material provided with three or more upright pieces cut and raised to the receiving plate area side while leaving the receiving plate area apart, and press-fitted and fixed to receiving holes defined inside these upright pieces A bearing device comprising an odd-shaped bearing. In the bearing device according to claim 1, when N is a natural number of 3 or more, the outer shape of the receiving plate area and the deformed bearing is a regular N square shape, and the number of the standing pieces is N, A bearing device, characterized in that a corner portion of the deformed bearing is positioned between adjacent upright pieces. The thrust bearing device according to claim 2, wherein the N is four. 4. The bearing device according to claim 1, wherein the deformed bearing includes a shaft through hole, and a thrust plate is interposed between the receiving plate region and the end surface of the deformed bearing. A bearing device comprising: A motor comprising the bearing device defined in any one of claims 1 to 4.

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